GnuPG is the GNU project's complete and free implementation of the OpenPGP standard as defined by RFC2440 . GnuPG allows to encrypt and sign your data and communication, features a versatile key managment system as well as access modules for all kind of public key directories.

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Mutt is a small but very powerful text-based mail client for Unix operating systems.
Though written from scratch, Mutt's initial interface was based largely on the ELM mail client. To a large extent, Mutt is still very ELM-like in presentation of information in menus (and in fact, ELM users will
... [More] find it quite painless to switch as the default key bindings are identical). As development progressed, features found in other popular clients such as PINE and MUSH have been added, the result being a hybrid, or "mutt." [Less]

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K9 is an opensource email client based on the Email application shipped with the initial release of Android.
K9 is focused on making it easy to chew through large volumes of email. It's our hope that K9 leads to improvements in the core Android mail client.
You can find out more on the
... [More] wiki.
If you're interested in contributing to K-9. please drop us a line.
ReleaseNotes describes changes in each version of K-9
BuildingK9 describes how to build the project
Developers: Join us on IRC on #k-9 on irc.freenode.net [Less]

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Mailcrypt is an Emacs Lisp package which provides a simple interface to public key cryptography with PGP/GPG. Mailcrypt makes strong cryptography a fully integrated part of your normal mail and news handling environment.

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Duply is a shell front end for the duplicity backup tool http://duplicity.nongnu.org/. It greatly simplifies it's usage by implementing backup job profiles, batch commands and more. Who says secure backups on non-trusted spaces are no child's play?

Desktop client application for the LEAP platform, supporting encrypted internet proxy, secure email, and secure chat (coming soon). The client is written in Python, runs on Linux, Mac, and Windows, and is licensed under the GPLv3.